ORCID Profile
0000-0001-6282-1339
Current Organisation
KU Leuven
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Publisher: SPIE-Intl Soc Optical Eng
Date: 27-06-2023
Publisher: SPIE
Date: 26-08-2022
DOI: 10.1117/12.2628151
Publisher: SPIE
Date: 26-08-2022
DOI: 10.1117/12.2627939
Publisher: EDP Sciences
Date: 03-2023
DOI: 10.1051/0004-6361/202244351
Abstract: Context . NOTT (formerly Hi-5) is a new high-contrast L ′ band (3.5–4.0 µm) beam combiner for the VLTI designed with an ambitious aim to be sensitive to young giant exoplanets down to 5 mas separation around nearby stars. The performance of nulling interferometers in these wavelengths is affected both by fundamental noise from the background and contributions of instrumental noise. This motivates the development of end-to-end simulations to optimize these instruments. Aims . The aim of this study is to enable a performance evaluation of NOTT and inform the design of such instruments with current and future infrastructures in mind, taking into account the different sources of noise and their correlation. Methods . SCIFYsim is an end-to-end simulator for single-mode-filtered beam combiners, with an emphasis on nulling interferometers. We use it to compute a covariance matrix of the errors. We then use statistical detection tests based on likelihood ratios to compute compound detection limits for the instrument. Results . With the current assumptions as to the performance of the wavefront correction systems, the errors are dominated by correlated instrumental errors down to stars of magnitude 6–7 in the L band, beyond which thermal background from the telescopes and relay system becomes dominant. Conclusions . SCIFYsim is suited to anticipating some of the challenges of design, tuning, operation, and signal processing for integrated-optics beam combiners. The detection limits found for this early version of NOTT simulation with the unit telescopes are compatible with detections at contrasts up to 10 5 in the L band at separations of 5–80 mas around bright stars.
Publisher: SPIE
Date: 26-08-2022
DOI: 10.1117/12.2629180
Publisher: SPIE
Date: 26-08-2022
DOI: 10.1117/12.2627942
Publisher: SPIE
Date: 26-08-2022
DOI: 10.1117/12.2627953
Location: France
No related grants have been discovered for Germain Garreau.